It is on the firewall under the hood close to the drivers side fender. There should be two relays close to the top (hood).
inside the fuel tank
The fuel pump relay is located on the radiator support bracket on the passenger side of the vehicle. It is the center relay.
It's a green relay located under the left (driver's) side of the dash
it is located on the fire wall under the hood on passangers side. under a plastic cover that says fuel pump relay.
GM vehicles do not have an inertia fuel cut off switch.
the black box on the left side of the trunk
The Fuel Pump relay is not located under the seat. It is located on the passenger side, under dash, above blower motor, mounted on firewall.
The fuel pump is controlled via the Automatic Shutdown Relay. This relay is located on the front fender, driver's side, behind the battery. It's the smallest relay in the group. hope this helps!
Under the drivers side dash
it is located behind the glove box you will have to remove the glove box.
Underneath your hood, behind the passenger side headlight, behind the core support, is a bank of 2-8 relays. One of those relays is the relay needed for your fuel pump. There will also be a fuel pump relay fuse located there.
Usually it's realy close to the fuel tank, under rear seats.